JP6394828B2 - Wireless communication system and method, wireless base station and control station - Google Patents

Description

(Description of related applications)
The present invention is based on the priority claim of Japanese Patent Application No. 2009-061470 (filed on Mar. 13, 2009), the entire contents of which are incorporated herein by reference. Shall.

  The present invention relates to a radio communication system having a plurality of radio base stations and a control station, wherein the control station optimizes settings in radio base stations other than the specific radio base station according to the state control of the specific radio base station About.

  In recent years, from the viewpoint of Green IT (Information Technology), research and development for power saving in wireless communication systems has been actively conducted.

  In Patent Document 1, a simple mobile phone system (PHS: Personal Handy-phone System) using a microcell is assumed, and wireless communication is performed between a radio base station and a mobile station arranged in each of a plurality of service areas. A transmission power control method in a radio base station in a mobile communication system that performs communication has been proposed. The radio base station receives a transmission signal from another radio base station, and based on the relationship between the information related to the communication status at the other radio base station and the received power from the other radio base station. The transmission power at the local station is controlled.

More specifically, the radio base station
・ Traffic conditions at surrounding wireless base stations,
-Monitor the received power from surrounding wireless base stations.

  As a result of the above monitoring, the radio base station determines that if another radio base station whose received power (received power from surrounding radio base stations) exceeds a predetermined threshold is in a low traffic state, Control to reduce the transmission power of the station.

  Even if this radio base station weakens its own transmission power, if the received power from the other radio base station is equal to or higher than the required threshold, the mobile station communicating with the own station is handed over to the other radio base station. Because it can, call disconnection does not occur and this is not a problem.

  Therefore, according to the transmission power control method of the radio base station disclosed in Patent Document 1, it is possible for each radio base station to voluntarily control the stop and start of transmission according to the surrounding state. For this reason, according to the transmission power control method of the wireless base station disclosed in Patent Document 1, it is possible to achieve power saving while flexibly taking into account the traffic situation.

  On the other hand, from the viewpoint of reducing operation costs (OPEX), research and development of network self-organization technology (SON: Self Organizing Network) in a wireless communication system (for example, a cellular system) has been actively conducted.

For SON,
・ Self-configuration
・ Self-optimization,
・ Self-healing
Technology for achieving different purposes has been studied (Non-Patent Documents 1 and 2).

In Non-Patent Document 1, as one of SON technologies,
・ Maximizing throughput characteristics,
・ Minimization of delay,
・ Maximizing network capacity
・ Maximize coverage,
Etc., radio parameter optimization for achieving each object is mentioned.

Examples of radio parameters include
・ Base station transmission power,
・ Base station antenna tilt angle,
・ Neighboring cell information,
There are handover parameters.

  One or more of these radio parameters are appropriately changed so as to achieve the above-described object.

  In Patent Document 2, when a radio base station (6f) is newly added, the radio base station (6f) has received the perch channel most strongly from other radio base stations. On the other hand, information indicating the state of the own station (6f) (used frequency, position information, etc.) is transmitted on a channel (for example, a common control channel) that other radio base stations can receive, and the neighboring radio base stations ( 6e) receives this information, extracts information indicating the state of the radio base station (6f), and establishes new information for other peripheral radio base stations (6a to 6d) via the base station control station (3e). The information on the radio base station (6f) is notified, and the other peripheral radio base stations (6a to 6d) are necessary for the peripheral station information (that is, the mobile station to switch channels) held by each station. Autonomous database of surrounding zone information) The mobile station is updated (peripheral zone table update processing: addition of the radio base station 6f), and the updated peripheral zone information is reported to each mobile station via the broadcast channel, which is a downlink common control channel. A configuration is disclosed in which the existence of 6f) is recognized, and standby in the radio zone of the radio base station (6f) and channel switching to the radio base station (6f) can be performed. In Patent Document 2, when a certain base station is newly established or abolished (after execution), the base station notifies the neighboring base stations of the establishment or abolition by radio, so that Add, delete.

JP 2003-037555 A JP 11-215552 A

NGMN technical documents: Use Cases related to Self Organizing Network. (Internet <URL> http://www.ngmn.org/uploads/media/NGMN_Use_Cases_Self_Organising_Network_2_02.pdf) 3GPP TS36.300 v8.7.0 22.3.2a (Internet <URL> http://www.3gpp.org/ftp/Specs/html-info/36300.htm) 3GPP TS36.902 v1.0.1 4.2 (Internet <URL> http://www.3gpp.org/ftp/Specs/html-info/36902.htm)

  The following is an analysis of the related art according to the present invention.

In the transmission power control in the radio base station according to the related technology described above, each radio base station
・ Information on the surrounding environment measured by the station,
-Transmit power control is performed independently according to a preset threshold. For this reason, in the related art, the influence of changing the transmission power, in particular, turning off the transmission, affects the surrounding radio base stations.

  As an example, in a cellular system having a self-optimizing function, a case where a certain radio base station autonomously performs transmission power control and turns off transmission is assumed (the following is a result of examination by the present inventor).

  Even when the radio base station (= radio base station A) autonomously turns off transmission at a certain time, another radio base station (= radio) that manages a cell adjacent to the cell of radio base station A The base station B group) is not notified of the fact that the radio base station A has turned off transmission.

  For this reason, when the wireless base station B group cannot receive (detect) the transmission signal of the wireless base station A, the wireless base station B group itself detects that it is necessary to reset the wireless parameter of the local station, Optimize radio parameters.

  Further, another radio base station (= radio base station C group) that manages a cell adjacent to the cell of the radio base station B group is similarly affected by the resetting of radio parameters of the radio base station B group, Optimize radio parameters of own station.

  As described above, the influence of the transmission power control (transmission off) based on the determination of only the radio base station A itself is one after another, such as the neighboring radio base station B group, and the neighboring radio base station C group. Ripple.

  In addition, the radio base station B group that once changed the radio parameter for optimization is also affected by the change of the radio parameter for the optimization of the radio base station C group, and the radio base station B group again It may happen that the parameter needs to be changed. Such re-change of the radio parameter is expected to be performed sequentially between adjacent radio base stations.

  In this case, the optimization of the radio parameters as a whole system does not readily converge (optimization takes time). For this reason, the delay that occurs from the time when the transmission of the radio base station A is turned off until the optimization of the radio parameters in the neighboring radio base stations is a problem. That is, when the radio base station A autonomously turns off transmission, it is required to improve the efficiency of resetting radio parameters to appropriate values in the peripheral radio base station group (knowledge by the present inventor).

Further, the period from the time when the transmission of the radio base station A is turned off until the optimization of the radio parameters in the peripheral radio base station is completed is a period in which the radio parameters are set to inappropriate values in the peripheral radio base station. Will be included. As a result, various problems are assumed to occur. For example,
・ When transmission power and antenna tilt angle are inappropriate, interference between adjacent cells increases.
If the neighboring cell information is inappropriate, it leads to unnecessary measurement (Measurement) in the wireless terminal (mobile station) (knowledge by the present inventor).

  It is assumed that the same problem occurs when the radio base station turns on transmission from the transmission off state. When a radio base station executes state control, it is required to realize a system that can efficiently self-optimize radio parameters in surrounding radio base stations (knowledge by the present inventor).

  Accordingly, an object of the present invention is to provide a radio communication system, a radio communication method, and a radio base station that can efficiently set radio parameters in neighboring radio base stations to appropriate values even when the radio base station performs state control. Is to provide a control station.

  As means for solving the above problems, according to the present invention, the following wireless communication system, wireless communication method, wireless base station, control station, program (or computer-readable recording medium storing the program) is provided. Is done.

  According to the present invention, a radio communication system having a radio base station and a control station is provided. In this wireless communication system, when a trigger for performing state control of the first wireless base station occurs in the first wireless base station, the first wireless base station, before starting the state control, at the start, Alternatively, in the execution stage of the state control, state control information that is information related to the state control is notified to at least one of the control station and another radio base station. The control station is one or both of state control information related to the first radio base station and management information related to radio parameters to be updated in accordance with the state control of the first radio base station. Transmit to at least a second radio base station that manages a cell adjacent to the cell of the first radio base station.

  According to the present invention, there is provided a radio communication method for defining operations of a radio base station and a control station in a radio communication system having a radio base station and a control station. In this wireless communication method, when a trigger for performing state control of the first wireless base station is generated in the first wireless base station, the first wireless base station is before starting the state control, at the start, or In the state control execution stage, state control information, which is information related to the state control, is notified to at least one of the control station connected to the first radio base station and managing the radio base station, or another radio base station To do. The control station is one or both of state control information related to the first radio base station and management information related to radio parameters to be updated in accordance with the state control of the first radio base station. Transmit to at least a second radio base station that manages a cell adjacent to the cell of the first radio base station.

  According to the present invention, when a trigger for performing state control of a radio base station occurs, state control information, which is information related to the state control, is started before the start of the state control, or at the start of the state control. There is provided a radio base station comprising means for notifying at least one of a control station that manages the radio base station and another radio base station.

  According to the present invention, receiving notification of state control information that is information related to state control from the first radio base station, state control information relating to the first radio base station, and the state of the first radio base station Provided by a control station that transmits one or both of management information related to radio parameters to be updated with control to at least a second radio base station adjacent to the cell of the first radio base station Is done.

  According to the present invention, there is provided a program (or a computer-readable recording medium storing the program) that causes a computer constituting the radio base station to execute the processing of the radio base station of the present invention. According to the present invention, there is provided a program (or a computer-readable recording medium storing the program) that causes a computer constituting the control station to execute the processing of the control station of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, even when a radio base station performs state control, the radio | wireless parameter in a surrounding radio base station can be set to an appropriate value efficiently.

It is a figure which shows the structure of the radio | wireless communications system of one Embodiment of this invention. It is a figure which shows another cell structure of the radio | wireless communications system of one Embodiment of this invention. It is a figure which shows the example of transmission OFF of the wireless base station of one Embodiment of this invention. It is a figure which shows another example of transmission OFF of the wireless base station of one Embodiment of this invention. It is a figure which shows the control procedure in case the wireless base station in the 1st Embodiment of this invention turns off transmission. It is a figure which shows another example of the control procedure in case the wireless base station in the 1st Example of this invention turns off transmission. It is a figure of the adjacent cell list | wrist in 1st Example of this invention. It is another figure of the adjacent cell list | wrist in the 1st Example of this invention. It is a figure which shows the control procedure in case the wireless base station in 1st Example of this invention turns on transmission. It is a figure which shows another example of the control procedure in case the wireless base station in the 1st Example of this invention turns on transmission. It is a figure of the adjacent cell list | wrist in 1st Example of this invention. It is another figure of the adjacent cell list | wrist in the 1st Example of this invention. It is a figure which shows the structure of O & M (OMC) in the 1st Example of this invention. It is a figure which shows the structure of the wireless base station eNB in 1st Example of this invention. It is a figure which shows the control procedure in case the wireless base station in the modification of the 1st Example of this invention turns off transmission. It is a figure which shows another example of the control procedure in case the wireless base station in the modification of the 1st Example of this invention turns off transmission. It is a figure which shows the control procedure in case the wireless base station in 2nd Example of this invention turns off transmission. It is a figure which shows another example of the control procedure in case the radio base station in the 2nd Example of this invention turns off transmission. It is a figure of the adjacent cell list | wrist in the 2nd Example of this invention. It is another figure of the adjacent cell list | wrist in the 2nd Example of this invention. It is a figure which shows the structure of the radio | wireless communications system 2 by this invention. It is a block diagram which shows the structure of the main radio base station in the 3rd Example of this invention. It is a figure which shows the control procedure in case the radio base station in the 3rd Example of this invention turns off transmission. It is a figure which shows the control procedure in case the radio base station in the 3rd Example of this invention turns on transmission. It is a flowchart which shows the example of the process sequence of O & M in the 1st and 2nd Example by this invention. It is a flowchart which shows the example of the process sequence of eNB3 in the 1st and 2nd Example by this invention. It is a flowchart which shows the example of the process sequence of eNB3 in the 1st and 2nd Example by this invention. It is a figure explaining the example which controls a power down in steps in the Example of this invention. It is a figure explaining the example which controls an antenna tilt angle in steps in the Example of this invention. It is a figure which shows ANR and its environment (FIG. 22.3.2a-1 of a nonpatent literature 2).

  According to one of the preferred embodiments of the present invention, when a trigger for performing state control of the first radio base station occurs in the first radio base station, the first radio base station At the start or at the execution stage of the state control, the control station or other radio base station that manages the radio base station by connecting the first radio base station to the state control information that is information related to the state control Notify at least one of the above. The control station is one or both of state control information related to the first radio base station and management information related to radio parameters to be updated in accordance with the state control of the first radio base station. Transmit to at least a second radio base station that manages a cell adjacent to the cell of the first radio base station. According to the present invention, even when other radio base stations around the own cell perform state control, the radio parameters of the own station can be efficiently set to appropriate values (that is, self-optimization). Is feasible). A radio communication system (mobile communication system) according to an embodiment of the present invention will be described. This wireless communication system has a suitable configuration conforming to the specification of “3GPP Long Term Evolution (3GPP LTE)”, but is not limited to this.

<Schematic configuration of first wireless communication system>
FIG. 1 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. This radio communication system includes a radio base station 20 (eNB: evolved Node B or E-UTRAN Node B (E-UTRAN: Evolved UTRAN)) eNB1, eNB2, eNB3, and an O & M 10 that is a control station that manages the radio base station 20. (Operation & Maintenance server: operation and maintenance server), OMC (Operation and Maintenance Center: also called operation and maintenance center), and radio terminal 30 (UE: User Equipment) UE1 and UE2. Here, it is assumed that the radio base stations eNB1, eNB2, and eNB3 manage the cell 1 (cell 1), the cell 2 (cell 2), and the cell 3 (cell 3), respectively. In the example illustrated in FIG. 1, UE1 is in cell 1 and UE2 is in cell 2. In addition, although UE1 shall be in the cell 1 and the cell 2 for description, of course, it is not limited to arrangement | positioning of UE.

  In addition, as shown in FIG. 2, the radio base stations eNB1, eNB2, and eNB3 were sectorized as cell 1-1 to 1-3, cell 2-1 to 2-3, and cell 3-1 to 3-3, respectively. Even in a configuration for managing a plurality of cells (sectors), the generality of the invention is not lost and is applicable. Here, for simplification of description, description will be made on the assumption of the configuration of FIG.

<First embodiment>
In the following, assuming that the radio base station eNB3 in FIG. 1 performs sleep and wakeup as an example of state control, transmission in the cell (cell 3) managed by the radio base station eNB3 is turned off ( A description will be given of an example in which sleep and wakeup are executed by turning on (Tx-off) and transmission (Tx-on). In addition, when turning off transmission, as shown in FIG.
(A) a case where transmission of a specific frequency (cell) managed by a certain radio base station is turned off;
(B) A case where transmission of all frequencies (cells) managed by a certain radio base station is turned off,
There are two possible ways. Here, the description will be made on the assumption of the case (b) as an example. Needless to say, the present invention can also be applied to the case (a).

  In the first embodiment of the present invention, in addition to the case shown in FIG. 1, as shown in FIG. 4, when cells having different sizes (for example, a macro cell and a micro cell) are overlapped, the smaller one is used. This can also be applied to the case where transmission of the cells (Cells1, s2, s3, s4) is turned off (Tx-off). The same applies when the transmission of the smaller cell is turned on (Tx-on).

  5 to 14 are diagrams for explaining the first embodiment of the present invention. The present embodiment will be further described with reference to FIGS. 1 and 5 to 14.

  In this embodiment, when the transmission of a cell (cell 3 in FIG. 1) managed by the radio base station eNB3 is turned off (Tx-off) or turned on (Tx-on), O & M (OMC) is used by the radio base station. For the radio base stations eNB1 and eNB2 around the cell managed by the eNB3, for example, delete the cell (cell 3) from the neighboring cell list held by the eNB1 and eNB2, or the cell (cell This is an example of instructing to add 3).

  FIG. 5 is a diagram illustrating a neighbor cell list control procedure when the radio base station eNB3 turns off transmission (Tx-off). In the sequence diagram of FIG. 5, the vertical line represents time, the box represents processing for each of eNB1 (2), eNB3, and O & M (OMC), and the horizontal arrow represents the source (source). The information (message) is transmitted to the destination (destination) (the arrow side is the destination). The same applies to other sequence diagrams.

eNB3
-The terminal in communication within its own cell (cell 3) does not exceed a predetermined threshold, or
The active terminal is not above a predetermined threshold and / or
・ Because the reception strength of the signal of the surrounding radio base station is strong and it can be determined that the surrounding radio base station can cover the range of the own cell (cell 3) even if transmission in the own cell (cell 3) is turned off, It is detected that the transmission may be turned off (see “Trigger for Tx-off” (transmission off trigger) in FIG. 5).

  Therefore, the O & M (OMC) is requested to turn off the transmission of the own cell (cell 3) (see “Request for Tx-off” (transmission off request) in FIG. 5). Here, a request for turning off transmission (Request for Tx-off) corresponds to the state control information.

  The trigger for detecting that the transmission may be turned off may be other than the above. For example, the radio base station turns off transmission according to whether a terminal or a group of terminals (CSG: Closed Subscriber Group) that are permitted to connect to the own base station exists in the own cell or a neighboring cell near the own cell. It can also be determined whether or not it can be turned off. Furthermore, the trigger may be activated when a predetermined time comes.

  The O & M (OMC) notifies the adjacent radio base stations eNB1 and eNB2 as management information to delete the cell 3 from the neighboring cell list in order for the eNB 3 to turn off transmission in the own cell (cell 3) ( FIG. 5 "Indication of removal of cell3 from neighbor cell list" (refer to deletion instruction of cell 3 from neighboring cell list).

  eNB1 and eNB2 update cell 3 from their respective neighboring cell lists (see “Neighbour cell list update” (neighboring cell list update) in FIG. 5), and update the neighboring cell list to O & M ( OMC) (see “Completion of cell3 removable from neighbor cell list” in FIG. 5 (cell3 deletion complete from neighboring cell list)).

  The O & M (OMC) notifies the eNB3 of permission to turn off the transmission in the cell 3 (see “Activation of Tx-off” (transmission off activation) in FIG. 5), and the eNB 3 operates in its own cell (cell 3 ) Is turned off (see “Tx-off” in FIG. 5).

  When eNB3 turns off transmission in its own cell (cell 3), eNB3 may be made to turn off transmission instantaneously, or transmission power and antenna tilt angle may be lowered step by step. May be. Examples of cases where the transmission power and the antenna tilt angle are lowered in stages are shown in FIGS.

  FIG. 28 shows a relationship between an index (Index), a step size of transmission power reduction corresponding to the index (Step size of Tx power down), and a period (Period). In FIG. 28, x1, x2, x3,... XN of transmission power down step sizes, and T1, T2, and T3 of periods are set to desired values. By holding the relationship (information) in FIG. 28 as a table in the O & M (OMC) and each radio base station, the O & M (OMC) notifies the corresponding index to the radio base station that lowers the transmission power. As a result, the radio base station knows how to reduce the transmission power. In the example of FIG. 28, in the case of index 1, the transmission power is decreased by a fixed value x1 for the period T1, that is, for the time T1. In the case of the index 3, the transmission power is decreased by a fixed value x1 per time T1, T2, T3... In the order of the periods T1, T2, T3 having different lengths. In the case of the index j, both the length of the cycle and the reduction step size are varied such that the transmission power is reduced by x1 in the first cycle T1, and then the transmission power is reduced by x2 in the cycle T2.

  The same applies to the antenna tilt angle. In the example shown in FIG. 29, the relationship between the index (Index), the step size of the antenna tilt angle (Step size of tilt angle down), and its period (Period) is shown. In FIG. 29, desired values are set for the antenna tilt angle reduction step sizes A1, A2, A3,..., AN, and the periods T1, T2, and T3. In the case of index 1, the antenna tilt angle is decreased by a fixed value A1 for the period T1, that is, for the time T1. In the case of index 3, the antenna tilt angle is decreased by a fixed value A1 for each time T1, T2, T3,... In the order of periods T1, T2, T3 having different lengths. In the case of the index j, both the length of the cycle and the reduction step size are varied such that the transmission power is reduced by A1 in the first cycle T1, and then the transmission power is reduced by A2 in the cycle T2.

  In this way, by reducing the transmission power and antenna tilt angle instantaneously rather than in steps, the propagation characteristics change drastically at the terminals under the base station where transmission is turned off, resulting in a sudden increase in communication quality. It is possible to avoid the deterioration of the call or the disconnection of the call. It can be realized in the same way as when the transmission power and the antenna tilt angle are increased.

  Then, after updating the neighboring cell list, the eNB 1 and the eNB 2 notify or individually notify the terminals in the own cell of information that needs to be notified to the terminals in the own cell at the time of the update.

As information notified to this terminal, for example,
-Updated neighbor cell list (also referred to as Neighbor Cell List: NCL),
・ Update information of neighboring cell list,
・ Maximum transmission power,
Handover parameters,
-Cell reselection parameters, or other radio parameters, etc.

  The terminal updates the radio parameter according to information notified or individually notified from the radio base station.

  Here, the intention of the radio base station to transmit the maximum value of the transmission power to the terminal is to allow the neighboring radio base stations to increase the maximum transmission power when a certain radio base station turns off the transmission. It is possible to increase the area.

In addition, as a handover parameter, for example,
・ Measurement report threshold (Measurement report threshold),
Cell specific offset of the serving cell (cell specific offset of the serving cell),
・ Frequency specific offset of the serving frequency,
-Cell individual offset of neighboring cells (cell Individual Offset)-Serving cell quality threshold (s-Measure) for determining whether the terminal performs Measurement
-The quality (trigger Quantity) that triggers the measurement report (Measurement report),
・ Hysteresis used to determine whether to perform measurement report (Measurement report)
Etc. may be used.

  In addition, since these are parameters related to measurement (Measurement) at the terminal, they can also be called measurement (Measurement) parameters.

Furthermore, as a cell reselection parameter, for example,
-Quality offset (q-Offset Cell) between serving cell and neighboring cells,
・ Quality offset between the serving frequency and other frequencies (q-Offset Freq),
-Cell reselection priority
Etc. may be used.

  By adjusting the handover parameter and the cell reselection parameter, there is an effect that the terminal is moved from the cell to which transmission is turned off to the neighboring cell, or the terminal can easily reselect the neighboring cell by itself.

  According to the present embodiment, by following such a procedure, even when a certain radio base station turns off transmission, the neighboring cell list in the neighboring radio base station can be appropriately updated without delay.

  In the sequence example shown in FIG. 5 described above, the O & M (OMC) has notified the neighboring base stations eNB1 and eNB2 of the update of the neighboring cell list (deletion of cell 3) (see “Indication” in FIG. 5). In this embodiment, as shown in FIG. 6, the management information is updated as well as the neighboring cell list as well as the update of other radio parameters (see “Indication” in FIG. 6). of removal of cell3 from neighbor cell list and updated other radio parameters information "(cell3 deletion from neighboring cell list and other updated radio parameters) (Refer to the instruction).

  At this time, after eNB1 and eNB2 notify O & M (OMC) of the update of the neighboring cell list (see “Completion of cell3 removable cell list” in FIG. 6 (cell3 deletion from the neighboring cell list is completed)). The radio parameter is updated (see “Radio parameters updates” in FIG. 6).

  And eNB1 and eNB2 notify a terminal of the update of a radio | wireless parameter as needed.

here,
As radio parameters other than the neighbor cell list,
・ Transmission power (maximum value or relative value to increase or decrease),
-Antenna tilt angle,
Handover parameters,
Cell reselection parameters,
Etc.

  In addition, eNB1 and eNB2 may update other radio parameters other than the neighboring cell list after updating the neighboring cell list (see “Neighbour cell list update” in FIG. 6), as shown in FIG. It may be done at the same time or before. Further, when the O & M gives permission to turn off transmission to the eNB 3, at the same time, immediately before or immediately after, the eNB 1 and 2 are instructed to update other radio parameters, and the eNB 1 and 2 follow the radio parameters accordingly. May be updated.

  In addition, the radio base stations eNB1 and eNB2 may update the transmission power and the antenna tilt angle (see “Radio parameters updates” in FIG. 6) instantaneously or stepwise.

  Here, the O & M (OMC) may notify the eNB 3 of the update of the radio parameter immediately after receiving the request for Tx-off or simultaneously with the activation of Tx-off. As the wireless parameter at this time, the above-described wireless parameter or the like can be considered.

  7 and 8 are diagrams for explaining the update of the neighbor cell list (NCL: Neighbor Cell List).

  FIG. 7 is a diagram illustrating an example of neighboring cell lists (NCL) held by eNB 1 and eNB 2 described with reference to FIGS. 1, 5, and 6. The neighbor cell list includes an index and an identifier (Target Cell ID: TCI) of a target cell associated with the index.

  7A and 7C, eNB3 and eNB2 before being notified from O & M (OMC) that eNB3 deletes from the neighboring cell list to turn off transmission in cell3. Is a neighbor cell list in FIG.

  As shown in FIG. 7A, in eNB1, as an adjacent cell. TCI # 2, TCI # 3, TCI # 4, and TCI # 8 (however, TCI # 8 is not shown in FIG. 7A) are recognized. TCI normally uses the global cell identity (Global Cell ID) and physical cell identity (Physical Cell ID) of the target cell, but for the sake of simplicity, TCI # x shall denote cell x.

  Similarly, as shown in FIG. 7C, in eNB2, as neighboring cells, TCI # 1, TCI # 3, TCI # 8, TCI # 9 (however, in FIG. 7C, TCI # 9 is (Not shown).

  When eNB1 and eNB2 are notified of deletion of cell 3 from O & M (OMC), as shown in FIG. 7B and FIG. 7D, TCI corresponding to cell 3 from their respective neighboring cell lists Delete # 3. At this time, TCI # 3 may be deleted, and the subsequent TCI # may be left-justified, or the place (TCI # 3) may be left blank.

  FIG. 8 is a diagram illustrating another example of neighboring cell lists held by each of eNB1 and eNB2.

  In each eNB, a white neighbor cell list that can be accessed by the terminal (White Neighbor Cell List) and a black neighbor cell list that cannot be accessed by the terminal (Black Neighbor Cell List) are prepared separately, and an index, It includes an identifier (TCI) of a target cell associated with the index. 8 (A) and 8 (C) show that in eNB1 and eNB2 before eNB3 is notified from O & M (OMC) that eNB3 deletes from the neighboring cell list to turn off transmission in cell3. It is a neighbor cell list.

  As shown in FIG. 8A, in eNB1, TCI # 2, TCI # 3, TCI # 4, and TCI # 8 are used as adjacent cells in the white adjacent cell list (however, in FIG. 8A, TCI # 8 is TCI # 5 and TCI # 6 are recognized as neighboring cells in the black neighboring cell list.

  Similarly, as shown in FIG. 8C, in eNB2, TCI # 1, TCI # 3, TCI # 8, and TCI # 9 are used as neighboring cells in the white neighboring cell list (however, in FIG. TCI # 7 is recognized as an adjacent cell in the black adjacent cell list.

  When eNB1 and eNB2 are notified of deletion of cell 3 from O & M (OMC), TCI # 3 is deleted from their respective white neighbor cell lists as shown in FIGS. 8B and 8D. Then, TCI # 3 is added to each black neighbor cell list.

  At this time, TCI # 3 is added to the end of the black neighbor cell list, added in the cell number order (ascending order or descending order), added in the quality order notified from the terminal (ascending order or descending order), etc. It may be a method of adding by, or a method of adding by other methods.

  FIG. 9 is a diagram illustrating a neighbor cell list control procedure when the radio base station eNB3 turns on transmission. The sequence at the time of transmission on shown in FIG. 9 basically performs the reverse procedure when turning off the transmission of FIG.

  The eNB 3 has a terminal that is communicating with another radio base station within a range in which the eNB 3 can provide a service (for example, the cell 3 in FIG. 1), and the reception strength of the transmission signal of the terminal is strong and / or the surrounding area It is detected that the load of the radio base station is high and it is necessary or efficient that the radio base station itself turns on transmission, that is, cell 3 is activated (“Trigger for Tx-on in FIG. 9). (See Send On Trigger).

Here, as a trigger that the radio base station that has turned off (sleeped) turns on (wakes up) the transmission,
-When a terminal belonging to a terminal group (CSG) that is allowed to connect to a predetermined number of local stations is in the vicinity of the local station or connected to a nearby radio base station,
・ When the specified time is reached,
Etc.

  Therefore, the eNB 3 requests the O & M (OMC) to turn on the transmission of the own cell (cell 3) (see “Request for Tx-on” (transmission on request) in FIG. 9). This request corresponds to the state control information.

  The O & M (OMC) notifies the adjacent radio base stations eNB1 and eNB2 as management information that cell 3 is added to the adjacent cell list in order for the eNB 3 to turn on transmission in its own cell (cell 3) (FIG. 9 (see “Indication of addition of cell 3 to neighbor cell list” (instruction for adding cell 3 to the neighbor cell list)).

  eNB1 and eNB2 add cell 3 to their respective neighboring cell lists (see “Neighbour cell list update” (neighboring cell list update) in FIG. 9), and notify O & M (OMC) of the completion of the neighboring cell list update. (See “Completion of cell3 addition to neighbor cell list” in FIG. 9 (completion of adding cell 3 to the neighbor cell list)).

  O & M (OMC) notifies eNB3 of permission to turn on transmission in cell 3 (see “Activation of Tx-on” in FIG. 9), and eNB3 turns on transmission in its own cell (cell 3). (See “Tx-on” in FIG. 9).

  Thereafter, after updating the neighboring cell list, eNB1 and eNB2 notify or individually notify the terminals in the own cell of information that needs to be notified to the terminals in the own cell at the time of the update. Here, as information notified to the terminal, for example, update information of the wireless parameter is used.

By following these steps,
-Without knowing that the neighboring radio base stations eNB1 and eNB2 turn on the transmission in cell 3 of the neighboring radio base station eNB3, leaving the radio parameter settings as they are, and increasing interference,
-Reporting when the terminals in the cells of the neighboring radio base stations eNB1 and eNB2 detect eNB3 (adjacent cell detection report),
Etc. can be avoided.

  On the other hand, in FIG. 9, the O & M (OMC) has notified the neighboring base stations eNB1 and eNB2 of the update of the neighboring cell list (addition of cell 3), but in this embodiment, as shown in FIG. The update of other radio parameters may be notified together with the update of the neighbor cell list ("Indication of addition of cell3 to neighbor cell list and updated other radio parameters information" in FIG. 10). Addition and updated other radio parameter instructions))).

  At this time, after eNB1 and eNB2 notify O & M (OMC) of the update of the neighbor cell list (see “Completion of cell3 addition to neighbor cell list” in FIG. 10 (addition of cell 3 to the neighbor cell list)) Then, the wireless parameter is updated (see “Radio parameters update” (radio parameter update) in FIG. 10).

  And eNB1 and eNB2 notify the update in a radio | wireless parameter to the terminal in the cell of an own station as needed. In addition, eNB1 and eNB2 may perform update of other radio parameters other than the adjacent cell list after the update of the adjacent cell list as illustrated in FIG. 10, or may be performed simultaneously or before. Further, when the O & M (OMC) gives eNB3 permission to turn on transmission, at the same time, immediately before or immediately after, eNB1 and eNB2 issue an instruction to update the radio parameters, and eNB1 and eNB2 change the radio parameters accordingly. You may make it update.

  11 and 12 are diagrams for explaining the update of the neighboring cell list. FIGS. 11A and 11C are diagrams showing examples of neighboring cell lists held by eNB1 and eNB2, respectively. Similar to FIG. 7, an index and an identifier of a target cell associated with the index ( TCI).

  When eNB1 and eNB2 are notified by the O & M (OMC) that eNB3 turns on the transmission of cell 3 in the state of the neighboring cell list in FIGS. 11 (A) and 11 (C), FIG. ), As shown in FIG. 11D, TCI # 3 is added to the neighbor cell list.

  On the other hand, in FIG. 12, similarly to FIG. 8, each of the eNB 1 and the eNB 2 has a white neighbor cell list that can be accessed by the terminal (White Neighbor Cell List) and a black neighbor cell list that is inaccessible by the terminal (Black Neighbor Cell List). It is an example in the case of holding.

  eNB1 and eNB2 are notified that O & M (OMC) turns on the transmission of cell 3 in the state of the white neighbor cell list and the black neighbor cell list in FIGS. 12 (A) and 12 (C). In this case, as shown in FIGS. 12B and 12D, TCI # 3 is added to the white adjacent cell list and simultaneously deleted from the black adjacent cell list. As already described above, the location to be added to the adjacent cell list is not necessarily the method shown in FIGS.

  FIG. 13 is a block diagram showing the configuration of O & M (OMC) in the first embodiment of the present invention. FIG. 14 is a block diagram showing a configuration of the radio base station eNB in the first embodiment of the present invention.

  In FIG. 13, the O & M (OMC) 10 includes a signal processing unit 101, a communication control unit 102, a base station management unit 103 that manages subordinate base stations, and an interface unit 104 with the radio base station eNB20.

  In FIG. 14, the radio base station eNB20 includes a receiver 201 and a transmitter 202 connected to an antenna 206, a signal processing unit 203, a communication control unit 204, and an interface unit 205 with the O & M (OMC) 10. Note that the method of turning off or on transmission by the radio base station (eNB 3) shown in the first embodiment is merely an example, and it is not necessary to use these methods for applying the present invention. A method using a reference or a trigger may be used.

  FIG. 25 is a generalized flowchart of the O & M (OMC) process in the sequences of FIGS. The O & M (OMC) processing procedure will be described with reference to FIGS. 13, 5, and 25.

  When the communication control unit 102 of the O & M (OMC) 10 receives a request for transmission off (TX-off) from the eNBx (for example, eNB3 of x = 3) via the interface unit 104 and the signal processing unit 101 (step S11). The base station management unit 103 is notified of a request for transmission off (TX-off).

  The base station management unit 103 of the O & M (OMC) 10 determines whether to accept the request (transmission off request) (step S12).

  When the base station management unit 103 of the O & M (OMC) 10 does not accept the transmission off request from the eNB 3 (No branch in step S12), a rejection response (rejection) is sent to the communication control unit 102, the signal processing unit 101, and the interface. The data is sent to the eNB 3 via the unit 104 (step S14).

  In the base station management unit 103 of O & M (OMC), when the transmission off request from the eNB 3 is accepted (Yes branch in step S12), along with the transmission off of the eNB 3, the neighboring radio base station eNB1, which is adjacent to the cell of the eNB 3, 2, it is determined whether other wireless parameters need to be updated (step S13).

  In the base station management unit 103 of O & M (OMC), when it is determined that other radio parameters need to be updated in the eNBs 1 and 2, the eNB 1, the communication unit 102, the signal processing unit 101, and the interface unit 104 2, an update instruction for the neighbor cell list (NCL) and other radio parameter information are transmitted (step S15). Note that the instruction to update the neighbor cell list (NCL) may be only an instruction, or may include update contents and the like.

  When the base station management unit 103 of the O & M (OMC) determines that no update of other radio parameters is necessary in the eNBs 1 and 2, the eNB 1 and 2 are connected via the communication control unit 102, the signal processing unit 101, and the interface unit 104. In response to this, an instruction to update the neighboring cell list (NCL) is transmitted (step S16).

  When the base station management unit 103 of the O & M (OMC) receives the update completion of the neighbor cell list (NCL) from the eNBs 1 and 2 via the interface unit 104, the signal processing unit 101, and the communication control unit 102 (Yes in step S17). (Branch), via the communication control unit 102, the signal processing unit 101, and the interface unit 104, an instruction for execution notification (activation) of cell transmission off (Tx-Off) managed by the eNB 3 is transmitted to the eNB 3 ( Step S18).

  FIG. 26 is a flowchart illustrating the processing procedure of the eNB 3. The processing procedure of the eNB 3 will be described with reference to FIG. 14, FIG. 5, and FIG. The communication control unit 204 of the eNB 3 measures the number of active terminals (UE) in the cell 3 (Step S21).

  When the number of active terminals (UE) satisfies the condition for transmission off (Yes in step S22), the communication control unit 204 of the eNB 3 sends the signal to the O & M (OMC) 10 via the signal processing unit 203 and the interface unit 205. On the other hand, a transmission off (Tx-off) request is transmitted (step S23).

  When the communication control unit 204 of the eNB 3 does not receive a rejection from the O & M (OMC) 10 (No in Step S24) and receives an execution notification (activation) (Yes in Step S25), the communication control unit 204 of the eNB 3 The transmission to the cell 3 controlled and managed by the eNB 3 is turned off (step S26). Note that the number of active terminals may be measured every predetermined time, may be an average value for a predetermined period, or may be other than that.

  FIG. 27 is a flowchart showing the processing procedure of eNB1 (2). The processing procedure of eNB1 (2) will be described with reference to FIGS.

  When the communication control unit 204 of the eNB1 (2) receives an instruction to update the neighboring cell list (NCL) from the O & M (OMC) 10 via the interface unit 205 and the signal processing unit 203 (Yes in step S21), The communication control unit 204 of the eNB 1 (2) updates the neighboring cell list (NCL) (not shown) held therein (step S32), updates the neighboring cell list, and updates the signal processing unit 203 and the interface unit 205. To the O & M (OMC) 10 (step S33).

  When the communication control unit 204 of the eNB1 (2) receives radio parameter information to be updated from the O & M (OMC) 10 via the interface unit 205 and the signal processing unit 203 (Yes in step S34), the eNB1 (2 The other wireless parameter information is updated (step S33).

<Modification of the first embodiment>
15 and 16 are diagrams for explaining a modification of the first embodiment of the present invention. FIG. 15 is a diagram illustrating a control procedure when the O & M (OMC) controls transmission off of the radio base station (eNB 3).

  First, the radio base stations eNB1, eNB2, and eNB3 report to O & M (OMC) traffic information such as the number of terminals in communication within the own cell or in an active state (see “Reporting” in FIG. 15). In the present embodiment, this report (Reporting) corresponds to the state control information.

  The O & M (OMC) decides to turn off the transmission in the cell cell 3 of the eNB 3 according to the information reported from the radio base station (“Decide Tx-off in cell 3 at eNB 3” in FIG. 15 (cell 3 of the eNB 3). In addition to notifying eNB1 and eNB2 that cell 3 is deleted from the neighboring cell list as management information, it is also notified of other radio parameter updates ("Indication of removal" in FIG. 15). of cell3 from neighbour cell list and updated other radio parameters information "(see deletion of cell 3 from neighboring cell list and indication of other radio parameters updated).

  eNB1 and eNB2 update the neighbor cell list (see “Neighbour cell list update” in FIG. 15), and then report the completion of the neighbor cell list update to O & M (OMC) (“Completion of cell3” in FIG. 15). “remove from neighbor cell list” (see deletion of cell 3 from the neighbor cell list) and other radio parameters are updated (see “Radio parameters update” (radio parameter update) in FIG. 15).

  The O & M (OMC) notifies the eNB 3 that transmission in the own cell (cell 3) is turned off (see “Activation of Tx-off” (activation of transmission off) in FIG. 15).

  After receiving the notification, the eNB 3 turns off the transmission in the cell 3 (“Tx-off” in FIG. 15).

  In the modification of the first embodiment, by taking such a procedure, even when there is a radio base station that turns off transmission in the own cell, control of radio parameters such as the neighboring cell list is more appropriately performed. It can be performed.

  FIG. 16 is a diagram illustrating a control procedure when the eNB 3 autonomously turns off transmission in its own cell (cell 3).

  First, eNB3 reports that the transmission is turned off in O & M (OMC) after turning off transmission in its own cell (cell 3) by some trigger as state control information ("Tx-off" in FIG. 16). (Refer to “Indication of Tx-off” in FIG. 16). Note that the transmission-off processing here is not only instantaneously performed, but also applies when the initial stage of performing stepwise is started (in the middle of performing transmission-off).

  O & M (OMC) deletes cell 3 from the neighbor cell list to eNB1 and eNB2, and notifies other radio parameter update ("Indication of removal of cell3 from neighbor cell list and updated other in FIG. 16). parameters information "(see deletion of cell 3 from neighboring cell list and indication of other radio parameters updated).

  eNB1 and eNB2 update the neighbor cell list (see “Neighbour cell list update” in FIG. 16), and notify the completion of neighbor cell list update to O & M (OMC) (“Completion of cell3 removable from” in FIG. 16). "neighbor cell list" (removal of cell 3 from the neighbor cell list) and other radio parameters are updated (see "Radio parameters updates" (radio parameter update) in FIG. 16).

  In the modification of the first embodiment, by taking such a procedure, even when there is a radio base station that autonomously turns off transmission in its own cell, a radio such as an adjacent cell list is more appropriately provided. Parameters can be controlled.

  Note that when the eNB 3 turns off transmission in its own cell (cell 3), it may be turned off immediately or the transmission power may be lowered step by step. In the latter case, O & M (OMC) may be notified when transmission power starts to be reduced. Note that O & M (OMC) may be configured to notify eNB 1 and eNB 2 of state control information indicating that eNB 3 has turned off transmission in its own cell (cell 3) due to some trigger. In this case, it is determined that eNB1 and eNB2 delete cell 3 from the neighbor cell list.

  The example in which transmission in the own cell is turned off has been described above, but when transmission in the own cell is turned on, the same method as described above can be used.

  Also in the modification of the first embodiment, the neighbor cell list may be updated by simply deleting / adding cell 3 from the neighbor cell list, or the white neighbor cell list and the black neighbor cell. A list may be used.

<Second embodiment>
Next, a second embodiment of the present invention will be described. In the second embodiment of the present invention, as in the first embodiment, the radio base station eNB3 in FIG. 1 turns off transmission (Tx-off) and turns on transmission in the cell (cell 3) managed by itself. Consider the case of (Tx-on).

  17 to 20 are diagrams for explaining the second embodiment of the present invention. In the second embodiment of the present invention, when the transmission of a cell (cell 3 in FIG. 1) managed by the radio base station eNB3 is turned off or on, the O & M (OMC) is set in each of the neighboring radio base stations eNB1 and eNB2. It is an example which instruct | indicates using the management information to change the attribute with respect to the said cell 3 in the adjacent cell list to hold.

  FIG. 17 is a diagram illustrating a neighbor cell list control procedure when the radio base station eNB3 turns off transmission.

eNB3 has no terminal in communication in its own cell (cell 3), or there is no terminal in an active state, and / or
Even if transmission in the own cell (cell 3) is turned off, the surrounding radio base station can cover the range of the own cell (cell 3).
It is detected that the transmission may be turned off (see “Trigger for Tx-off” (transmission off trigger) in FIG. 17).

  Therefore, the eNB 3 requests the O & M (OMC) to turn off transmission in the own cell (cell 3) (see “Request for Tx-off” (transmission off request) in FIG. 17). Note that this request to turn off transmission corresponds to the state control information.

  The O & M (OMC) notifies the neighboring radio base stations eNB1 and eNB2 to change the attribute related to the cell (cell 3) in the neighboring cell list held by each of them (“Indication of updated neighbor cell list” in FIG. 17). information "(indication of updated neighbor cell list information)).

  eNB1 and eNB2 update the neighbor cell list (see “Neighbour cell list update” in FIG. 17), and report the completion of neighbor cell list update to O & M (OMC) (“Completion of neighbor cell list update” in FIG. 17). (Adjacent cell list update completed))).

  The O & M (OMC) notifies the eNB 3 that transmission in the own cell (cell 3) is turned off (see “Activation of Tx-off” (activation of transmission off) in FIG. 17).

  The eNB 3 turns off transmission in its own cell (cell 3) according to the notification (“Tx-off” in FIG. 17).

  In the present embodiment, by using such a procedure to turn off transmission of a certain radio base station, the neighboring cell list in the neighboring radio base station can be managed efficiently and appropriately.

  In this embodiment, as shown in FIG. 18, as management information, the O & M (OMC) may notify the update of other radio parameters together with the update notification of the neighboring cell list (“Indication of updated” in FIG. 18). Neighbor cell list information and updated other radio parameters information "(refer to updated neighbor cell list information and other updated radio parameter information instructions).

In this case, eNB1 and eNB2
Update the neighbor cell list (see “Neighbour cell list update” in FIG. 18).
-After reporting the neighbor cell list update to the O & M (OMC) (see "Completion of neighbor cell list update" in FIG. 18)
Update other radio parameters (refer to “Radio parameters update” (radio parameter update) in FIG. 18).

  According to the present embodiment, by using such a procedure to turn off transmission of a certain radio base station, management of neighboring cell lists and setting of other radio parameters in neighboring radio base stations can be performed efficiently and appropriately. Can do. In this embodiment, the update of other radio parameters other than the neighbor cell list in eNB1 and eNB2 may be performed after the neighbor cell list is updated as shown in FIG. 18, or may be performed simultaneously or before. In this case, the adjacent cell list corresponds to an adjacent relationship table (NRT). Further, the update notification of other radio parameters may be sent to the eNB 1 and the eNB 2 before, at the same time, or after the execution notification that the O & M turns off the transmission to the eNB 3.

  19 and 20 are diagrams for explaining the update of the neighbor cell list in the second embodiment of the present invention. 19A to 19D are examples of neighboring cell lists held by each of eNB1 and eNB2, and an index, an identifier of a target cell associated with the index (Target Cell ID: TCI), and a target Assume that each cell has attributes (“No Remove” (cannot be deleted), “No HO” (cannot be deleted), “No X2” (no X2)). Note that FIG. 19E shows that the attribute “No Remove” of TCI # 2 and # 3 is checked.

here,
HO is Hand Over,
X2 represents an interface between base stations in 3GPP LTE.

  Such a neighbor cell list is also referred to as “neighbor relation table (also referred to as“ NRT ”)”.

  An NRT, which is an adjacent cell list including an index, an identifier (TCI) of a target cell associated with the index, and an attribute for each target cell as one entry, is an ANR (Automatic Neighbor Relation) function in LTE, as will be described later. (Non-Patent Document 2).

  When “No Remove” is checked (check symbol) in the adjacent relationship table (NRT), the radio base station never deletes the cell from the adjacent cell list (deletion prohibited).

  When “No HO” is checked, the radio base station does not use the cell as a handover target (use prohibited).

  When “No X2” is checked, X2 is not used (cannot be used) in order to perform some procedure for the radio base station that manages the cell.

  In the example of FIG. 19A, the eNB 1 recognizes TCI # 2, # 3, and # 4 as neighboring cells, and the attribute of “No Remove” is given to all.

  On the other hand, as shown in FIG. 19C, the eNB 2 recognizes TCI # 1, # 3, and # 8 as neighboring cells, and is similarly given the attribute of “No Remove” Further, it is assumed that the attribute “No HO” is also given to TCI # 8.

  When eNB1 and eNB2 are notified from O & M (OMC) that the attribute of TCI # 3 is changed because eNB3 turns off transmission of its own cell (cell 3), FIG. 19 (B ), The adjacent cell list is updated as shown in FIG.

  As shown in FIGS. 19B and 19D, in this embodiment, eNB1 and eNB2 check the attributes “No HO” and “No X2” for TCI # 3, and the adjacent cell list Has been updated.

  At this time, the O & M (OMC) may instruct eNB1 and eNB2 to update the same neighboring cell list, or may give another instruction.

  Although not shown in the drawing, since the eNB 3 turns on transmission in its own cell (cell 3), the same applies to the case where the attribute change for the TCI # 3 is notified.

  For example, the neighbor cell list may be updated by unchecking “No HO” and “No X2” of TCI # 3.

  FIG. 20 is a diagram showing another example of the neighbor cell list in the second embodiment of the present invention. In the example of FIG. 20, “No Tx” is added as a new attribute to the adjacent cell list of FIG. When the attribute “No Tx” is checked in the neighboring cell list, the radio base station still recognizes the cell as a neighboring cell, but does not transmit (not serving) the cell. It operates as if it were considered. Note that FIG. 20E shows that the attribute “No Remove” of TCI # 2 and # 3 is checked.

  eNB1 and eNB2 change the attribute for TCI # 3 because eNB3 turns off transmission of its own cell (cell 3) from O & M (OMC) from the state of FIG. 20 (A) and FIG. 20 (C). 20B and 20D, a new check is made to “No HO”, “No X2”, and “No Tx” among the attributes of TCI # 3. Put in.

  In the example shown in FIG. 20, “No Tx” is checked and “No HO” and “No X2” are also checked, but “No HO” and “No X2” are not checked. Just checking “No Tx”, it may be considered that the same restrictions are given as when “No HO” and “No X2” are checked.

  Although not shown in the figure, since the eNB 3 turns on transmission in its own cell (cell 3), it is the same when the attribute change for TCI # 3 is notified, for example, “No HO” of TCI # 3, “No X2” and “No Tx” may be unchecked and the neighboring cell list may be updated.

  Further, instead of “No Tx”, another attribute indicating that the radio base station turns off transmission in its own cell may be used.

  For example, “Tx-off”, “Tx stopped” (stop), “Sleep” (sleep), “Non-active” (not active), “Inactive” (inactive), “No Service” (service unavailable), “Out-of-service” (out of service area) or the like may be used. Further, not only the attribute after completion, but also an attribute representing a transient state such as “Power Down” (power off) or “Power Up” (power on).

  On the other hand, in the adjacency table (NRT), the wireless base station has another attribute (for example, “Tx-on” (transmission on), “Awake” (wakes up)) indicating that transmission in the own cell is on. , “Wake up”, “Active” (active)), and in this case, the neighboring cell list is managed so as to be checked when it is on. Here, FIG. 25 corresponds to the O & M (OMC) processing in the sequences of FIGS. 17 and 18, and the adjacency table corresponds to the adjoining cell list of FIG. Similarly, FIGS. 26 and 27 correspond to the processes of eNB3 and eNB1 (2), respectively.

<Schematic configuration of second radio communication system>
FIG. 21 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to still another embodiment of the present invention. The radio communication system 2 includes radio base stations eNB1, eNB2, and eNB3 and a main radio base station (master eNB) eNB0 that is a control station that manages peripheral radio base stations. Here, it is assumed that the radio base stations eNB0, eNB1, eNB2, and eNB3 manage cell 0, cell 1, cell 2, and cell 3, respectively. The main radio base station (master eNB) is a device that implements a part of the functions of the control station (O & M) described above.

  As shown in FIG. 22, for example, the main radio base station (master eNB) includes a receiver 201, a transmitter 202, a signal processing unit 203, a communication control unit 204, and a state management unit 207. In 207, the neighboring base stations are managed.

<Third embodiment>
23 and 24 are diagrams for explaining a third embodiment of the present invention. In the present embodiment, a case is considered in which the radio base station eNB3 in FIG. 21 turns off transmission (Tx-off) and turns on transmission (Tx-on) in a cell (cell 3) managed by itself.

  Further, in the present embodiment, when the transmission of a cell (cell 3 in FIG. 1) managed by the radio base station eNB3 is turned off or on, the main radio base station eNB0 is connected to the periphery via X2 which is an interface between the base stations. Instructs the radio base stations eNB1 and eNB2 to delete the cell (cell 3) from the neighbor cell list or add the cell (cell 3) to the neighbor cell list, and from the neighbor cell list held by the own station This is an example of deleting or adding a cell (cell 3).

  FIG. 23 is a diagram illustrating a neighbor cell list control procedure when the radio base station eNB3 turns off transmission.

eNB3
-There is no terminal in communication in its own cell (cell 3), or
-No active terminal and / or
-Even if transmission in the own cell (cell 3) is turned off, the surrounding radio base station can cover the range of the own cell (cell 3),
From this, it is detected that the transmission may be turned off (see “Trigger for Tx-off” (transmission off trigger) in FIG. 23). Therefore, the main radio base station eNB0 is requested to turn off the transmission of the own cell (cell 3) (see “Request for Tx-off” (transmission off request) in FIG. 23).

  eNB0 notifies the neighboring radio base stations eNB1 and eNB2 that the cell 3 is to be deleted from the neighboring cell list (“Indication of removal of cell3 from neighbor cell list” in FIG. 23 (an instruction to delete the cell 3 from the neighboring cell list). And cell 3 is deleted from the neighbor cell list of the own station (see “Neighbour cell list update” (neighbor cell list update) in FIG. 23).

  eNB1 and eNB2 delete cell 3 from their respective neighbor cell lists (see “Neighbour cell list update” (neighbor cell list update) in FIG. 23), and complete the update of the neighbor cell list for the main radio base station eNB0. (Refer to “Completion of cell 3 removable from neighbor cell list” in FIG. 23 (deletion of cell 3 from the neighbor cell list)).

  eNB0 notifies eNB3 that transmission of the own cell (cell 3) may be turned off (see “Activation of Tx-off” (activation of transmission off) in FIG. 23), and eNB3 transmits in cell 3. Is turned off ("Tx-off" in FIG. 23).

  Even when the eNB 3 turns on transmission in its own cell (cell 3), an appropriate neighboring cell list can be managed based on the same concept, and the procedure is shown in FIG.

  The eNB 3 has a terminal that is communicating with another radio base station within a range in which the eNB 3 can provide a service (for example, cell 3 in FIG. 1), the reception strength of the transmission signal of the terminal is strong, and the self turns on transmission. 3 is detected to be active or efficient (see “Trigger for Tx-on” (transmission on trigger) in FIG. 24).

  Therefore, the main radio base station eNB0 is requested to turn on transmission of the own cell (cell 3) (see “Request for Tx-on” (transmission on request) in FIG. 24).

  The main radio base station eNB0 notifies the neighboring eNB1 and eNB2 that the cell 3 is to be added to the neighboring cell list (“Indication of addition of cell3 to neighbor cell list” in FIG. 24 (cell 3 to the neighboring cell list). Cell 3) is added to the neighbor cell list of the own station (see “Neighbour cell list update” (update of neighbor cell list) in FIG. 24).

  eNB1 and eNB2 add cell 3 to their respective neighbor cell lists (see “Neighbour cell list update” (update of neighbor cell list) in FIG. 24), and report the completion of the neighbor cell list update to main radio base station eNB0. (Refer to “Completion of cell 3 addition to neighbor cell list” in FIG. 24 (completion of addition of cell 3 to the neighbor cell list)).

  The main radio base station eNB0 notifies the eNB3 that transmission in the cell 3 may be turned on (see “Activation of Tx-on” (activation of transmission on) in FIG. 24), and the eNB3 in the cell 3 The transmission is turned on (see “Tx-on” in FIG. 24).

  According to the present embodiment, the neighbor cell list can be managed efficiently and appropriately by such a procedure even when there is a radio base station that turns transmission off or on in the vicinity. In addition, in a present Example, when eNB3 turns off transmission in an own cell (cell 3), the main radio base station eNB0 does not delete the said cell (cell 3) from the adjacent cell list which the own station holds. Or leave it undeleted and give some information (for example, information that cell 3 is only temporarily turned off) and turn it on again You may make it prepare for.

  In the above embodiment, as the state control, the case where the radio base station turns off or on the transmission in its own cell (on / off of transmission of a specific frequency, on / off of all transmissions of the radio base station) is woken up. Although the example of / sleep has been described, it is needless to say that the present invention is not limited thereto. For example, the present invention can be applied when a wireless base station is newly installed, removed, or moved. Further, the definition of sleep of the radio base station may be any one of stopping (off) only the transmission of the radio unit, stopping (off) both transmission and reception, and turning off the power.

In addition, the wireless communication system targeted by the present invention is not limited to 3GPP LTE,
3GPP WCDMA (registered trademark) (Wideband Code Division Multiple Access),
-GSM (registered trademark) (Global System for Mobile communications),
・ WiMAX (Worldwide Interoperability for Microwave Access)
The present invention can also be applied. In 3GPP WCDMA or the like, there may be an O & M function in a radio network controller (RNC) connected to a radio base station.

  The present invention is supplemented in relation to Non-Patent Document 2 with respect to an automatic neighbor relationship function (ANR) (see Non-Patent Document 2). The purpose of the ANR function is to relieve the burden of manually managing the neighbor relationship (NR) by the operator.

  FIG. 30 is a diagram showing an ANR and its environment, and quotes FIG. 22.3.2a-1 (interaction between eNB and O & M by ANR) of Non-Patent Document 2.

  The ANR function is implemented in the radio base station eNB and manages an NRT (Neighbour Relation Table). When a neighbor detection function in the ANR detects a new neighbor cell, the neighbor detection function adds it to the NRT. The neighbor removal function (Neighbor Removal Function) removes, for example, expired neighbor relations (outulated NRs) from the NRT.

  The neighbor detection function (Neighbor Detection Function) and the neighbor removal function (Neighbor Removal Function) are implementation-specific.

The neighbor cell relationship (NR) in the context of ANR is defined as: The existing NR (Neighbour Relation) from the source cell to the target cell is the eNB that controls the source cell,
a) Know the ECGI / CGI and PCI of the target cell.
b) There is an entry in the NRT (Neighbour Relation Table) for the source cell that identifies the target cell.
c) Attributes in NRT are defined by O & M or set to default values.

  The eNB holds the NRT (FIG. 30) for the cell that the eNB has. For each NR, the NRT includes a target cell identifier (TCI) that identifies the target cell. In the case of E-UTRAN, TCI corresponds to an E-UTAN cell global identifier (ECGI) and a physical cell identifier (PCI) of the target cell. Each NR has four attributes, NoRemove, NoHO, NoX2, and NoTx.

  Among these, when NoRemove is checked, the eNB does not delete NCL (Neighbour Cell Relationship) from the NRT.

  If No HO is checked, the Neighbor Cell Relation is not used for handover by the eNB.

  When NoX2 is checked, Neighbor Relation does not use X2 for the eNB to start the procedure of parenting the target cell.

  When NoTx is checked, NR (Neighbor Relation) is not used for measurement by the eNB.

  NR (Neighbour cell Relationship) is a cell-cell relationship, and X2 is set between two eNBs. NR is unidirectional and the X2 link is bidirectional.

  As for ANR, O & M can manage NRT. O & M can add and delete NR. O & M can change the attributes of NRT. O & M is notified of NRT changes.

  Next, on / off of the EUTRAN cell implemented in the present invention will be described.

  If the eNB is not necessary, it can perform Tx-off (transmission off) in its cell. If necessary, the eNB can perform Tx-on (transmission on) in its own cell.

  Whether the eNB performs Tx-on / off, that is, the determination of Tx-on / off is implementation-dependent. However, in this case, the O & M can manage the NRT in order to avoid a failure situation. For example, there is a problem that a UE in a cell in which the eNB performs Tx-off disconnects the call, and an increase in interference with an adjacent cell of the cell in which the eNB performs Tx-on.

  When the eNB performs Tx-on / off in its own cell, it is performed in the following sequence.

1. When a trigger for performing Tx-on / off occurs, the eNB requests the O & M for Tx-on (off) in a certain cell.

2. O & M changes the attribute in the NRT of the neighboring eNB. For example, O & M adds or removes a check on the NoTx attribute for the corresponding cell. Moreover, O & M may transmit the radio parameter information to be updated in the neighboring eNB.

3. Neighboring eNB updates its NRT. Further, the wireless parameter is updated based on an instruction from the O & M.

4). O & M transmits activation of Tx-on (off) to the corresponding eNB, and performs Tx-on (off) to the eNB.

In “4.2.2.1 Input data, definition of Measurements of Performance data” in Non-Patent Document 3, the following input data is exchanged between the O & M and the eNB. That is,
Number of active UEs in the cell.

  It should be noted that other measurements including eNB measurement are items to be considered (FFS: For Furter Study).

The output parameter of the SON (Self Organizing Network) function may include the following information.
・ Self-healing (self-healing) to switch off unnecessary cells from the viewpoint of operation (system capacity, coverage, etc.).
・ Self-organization (self-optimization) of neighboring cell relations regarding cell switching on and off.

  The measurement of “4.2.2.1 Input data, definition of Measurements of Performance data” in Non-Patent Document 3 is reported to the central SON entity. Whether the SON entity is centralized or not is FFS.

  It should be noted that the disclosures of the above-mentioned patent documents and non-patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

The following is a summary of the embodiments of the present invention.
(Appendix 1)
A plurality of radio base stations;
A control station connected to the plurality of radio base stations;
Have
When a trigger for performing state control of the first radio base station occurs in the first radio base station,
The first radio base station transmits the state control information, which is information related to the state control, before the start of the state control, at the start of the state control, or at the execution stage of the state control, of the control station or another radio base station. A radio communication system characterized by notifying at least one of them.

(Appendix 2)
The control station
State control information regarding the first radio base station;
Managing one or both of management information on radio parameters to be updated in accordance with the state control of the first radio base station, and managing at least a cell adjacent to the cell of the first radio base station The wireless communication system according to supplementary note 1, wherein the wireless communication system transmits to a second wireless base station.

(Appendix 3)
A plurality of radio base stations;
A control station connected to the plurality of radio base stations and managing the plurality of radio base stations;
Have
Before the start of the state control of the first radio base station, at the start of the state control, or at the execution stage of the state control, the first radio base station transmits the state control information that is information related to the state control to the control station or Notify at least one of the other radio base stations,
The control station has at least one of the plurality of radio base stations connected to the control station with at least one of management information related to radio parameters to be updated in accordance with the state control and the state control information. A radio communication system characterized by notifying a second radio base station that manages a cell adjacent to a cell of the base station.

(Appendix 4)
Any one of Supplementary notes 1 to 3, wherein the control station is either a higher-level station that manages the radio base station or a main radio base station that performs centralized control of the radio base station. The wireless communication system described.

(Appendix 5)
The state control is
New installation, removal or relocation of the first radio base station,
ON / OFF of transmission at a specific frequency managed by the first radio base station,
Wake-up / sleep of said first radio base station,
The wireless communication system according to any one of appendices 1 to 4, wherein the wireless communication system is any one of the following.

(Appendix 6)
The wireless communication system according to appendix 5, wherein the transmission is turned on / off by controlling transmission power in stages.

(Appendix 7)
The state control information is
A result of the state control;
A notice of the state control;
The request for state control;
Details of the state control;
Information serving as a criterion for determining whether or not to perform the state control;
The wireless communication system according to any one of appendices 1 to 6, including at least one of the following.

(Appendix 8)
The management information is
Wireless parameter settings,
Difference from before update of wireless parameter setting value,
Control information about radio parameters,
The wireless communication system according to Supplementary Note 2 or 3, wherein at least one of the wireless communication systems is included.

(Appendix 9)
The radio parameter is
Neighbor cell list,
Transmit power,
Antenna tilt angle,
Handover parameters,
Cell reselection parameters,
The wireless communication system according to supplementary note 8, including at least one of the following.

(Appendix 10)
The second radio base station is
The transmission power and / or the value of the antenna tilt angle,
The wireless communication system according to appendix 9, wherein the wireless communication system is controlled step by step.

(Appendix 11)
Control information related to the neighbor cell list is
Add to or delete from the neighboring cell list of the cell of the radio base station that performs the state control,
Attribute change for a cell managed by a radio base station that performs the state control;
The wireless communication system according to supplementary note 9, wherein the wireless communication system is any one of the above.

(Appendix 12)
The attribute in the neighbor cell list is
Limited access (Black list),
No access restrictions (White list),
Cannot be deleted from the neighbor cell list (No Remove),
Handover not possible (No Handover),
No connection between radio base stations,
No information exchange between wireless base stations (No X2),
Transmission off (Tx-off or No Tx), or
Sleep,
The wireless communication system according to supplementary note 11, including at least one of the following.

(Appendix 13)
Any one of appendices 2, 3, 8 to 12, wherein the second radio base station updates the radio parameter according to the management information and notifies the radio terminal in the own cell of the update. A wireless communication system according to one.

(Appendix 14)
The first radio base station notifies the control station of the state control information before performing the state control,
The control station, after notifying the management information to at least the second radio base station, notifies the first radio base station of the execution information of the state control, the additional notes 2, 3, The wireless communication system according to any one of 8 to 13.

(Appendix 15)
The execution information of the state control is
An instruction to execute or complete the state control;
The value of the parameter used for the state control,
15. The wireless communication system according to supplementary note 14, including at least one of them.

(Appendix 16)
At the occurrence of a trigger for performing state control of the first radio base station in the first radio base station,
The one radio base station transmits state control information, which is information related to the state control, at least either of the control station or another radio base station before the start of the state control, at the start of the state control, or at the execution stage of the state control. A wireless communication method characterized by notifying either of them.

(Appendix 17)
The control station
State control information regarding the first radio base station;
Managing one or both of management information on radio parameters to be updated in accordance with the state control of the first radio base station, and managing at least a cell adjacent to the cell of the first radio base station The wireless communication method according to appendix 16, wherein the wireless communication method transmits to a second wireless base station.

(Appendix 18)
The first radio base station transmits the state control information, which is information relating to the state control, before the start of the state control of the first radio base station, or at the start of the state control. Notify at least one of the radio base stations,
The control station, at least one of the plurality of radio base stations connected to the control station, is at least one of the first radio base station and at least one of management information related to radio parameters updated with the state control and the state control information. A radio communication method comprising: notifying a second radio base station that manages a cell adjacent to a cell of the station.

(Appendix 19)
Any one of Supplementary notes 16 to 18, wherein the control station is either a higher-level station that manages the radio base station or a main radio base station that performs centralized control of the radio base station. The wireless communication method described.

(Appendix 20)
The state control is
New installation, removal or relocation of the first radio base station,
ON / OFF of transmission at a specific frequency managed by the first radio base station,
Wake-up / sleep of said first radio base station,
The wireless communication method according to any one of supplementary notes 16 to 18, wherein the wireless communication method is any one of the following.

(Appendix 21)
The wireless communication method according to appendix 20, wherein the transmission is turned on / off by controlling transmission power in stages.

(Appendix 22)
The state control information is
A result of the state control;
A notice of the state control;
The request for state control;
Details of the state control;
Information serving as a criterion for determining whether or not to perform the state control;
The wireless communication method according to any one of supplementary notes 16 to 21, wherein the wireless communication method includes at least one of the following.

(Appendix 23)
The management information is
Wireless parameter settings,
Difference from before update of wireless parameter setting value,
Control information about radio parameters,
The wireless communication method according to appendix 17 or 18, characterized in that it includes at least one of them.

(Appendix 24)
The radio parameter is
Neighbor cell list,
Transmit power,
Antenna tilt angle,
Handover parameters,
Cell reselection parameters,
24. The wireless communication method according to appendix 23, comprising at least one of the following.

(Appendix 25)
The second radio base station is
The transmission power and / or the value of the antenna tilt angle,
The wireless communication method according to appendix 24, wherein the wireless communication method is controlled step by step.

(Appendix 26)
Control information related to the neighbor cell list is
Add to or delete from the neighboring cell list of the cell of the radio base station that performs the state control,
Attribute change for a cell managed by a radio base station that performs the state control;
25. The wireless communication method according to appendix 24, which is any one of the above.

(Appendix 27)
The attribute in the neighbor cell list is
Limited access (Black list),
No access restrictions (White list),
Cannot be deleted from the neighbor cell list (No Remove),
Handover not possible (No Handover),
No connection between radio base stations,
No information exchange between wireless base stations (No X2),
Transmission off (Tx-off or No Tx), or
Sleep,
27. The wireless communication method according to appendix 26, including at least one of the following.

(Appendix 28)
The second radio base station updates the radio parameter according to the management information, and notifies the radio terminal in the own cell of the update. Wireless communication method.

(Appendix 29)
The first radio base station notifies the control station of the state control information before performing the state control,
The control station notifies the control information to the first radio base station after notifying the management information to a radio base station other than the first radio base station. 28. The wireless communication method according to any one of 28.

(Appendix 30)
The state control execution information is
An instruction to execute or complete the state control;
The value of the parameter used for the state control,
32. The wireless communication method according to appendix 29, including at least one of the above.

(Appendix 31)
When a trigger for performing state control of the radio base station occurs, state control information, which is information related to the state control, is transmitted to the control station or other before the start of the state control, or at the start of the state control. A radio base station comprising means for notifying at least one of the radio base stations.

(Appendix 32)
32. The radio base station according to appendix 31, wherein the radio base station receives at least one of management information related to radio parameters to be updated with the state control and the state control information from the control station.

(Appendix 33)
The state control is
New installation, removal or relocation of the radio base station,
ON / OFF of transmission at a specific frequency managed by the radio base station,
Wake-up / sleep of the radio base station,
32. The radio base station according to appendix 32, wherein

(Appendix 34)
34. The radio base station according to appendix 33, wherein the transmission is turned on / off by controlling transmission power in stages.

(Appendix 35)
The management information is
Wireless parameter settings,
Difference from before update of wireless parameter setting value,
Control information about radio parameters,
Including at least one of
The radio parameter is
Neighbor cell list,
Transmit power,
Antenna tilt angle,
Handover parameters,
Cell reselection parameters,
33. The radio base station according to appendix 32, including at least one of the following.

(Appendix 36)
The transmission power and / or the value of the antenna tilt angle,
The radio base station according to attachment 35, which is controlled step by step.

(Appendix 37)
Control information related to the neighbor cell list is
Add to or delete from the neighboring cell list of the cell of the radio base station that performs the state control,
Attribute change for a cell managed by a radio base station that performs the state control;
37. The radio base station according to appendix 35, which is any of the above.

(Appendix 38)
The attribute in the neighbor cell list is
Access restricted list (Black list),
List without access restriction (White list),
Cannot be deleted from the neighbor cell list (No Remove),
Handover not possible (No Handover),
No connection between radio base stations,
No information exchange between wireless base stations (No X2),
Transmission off (Tx-off or No Tx), or
Sleep,
37. The radio base station according to appendix 37, including any of the above.

(Appendix 39)
The wireless base station other than the wireless base station that performs the state control updates the wireless parameter according to the management information, and notifies the wireless terminal in the own cell of the update. The radio base station described.

(Appendix 40)
Before performing the state control, notify the control station of the state control information,
In the control station, after notifying the management information to a radio base station other than the radio base station that has notified the state control information, notifies the radio base station that has notified the state control information of the state control execution information,
40. The radio base station according to any one of appendices 31 to 39, comprising means for receiving state control execution information from the control station.

(Appendix 41)
Received notification of status control information, which is information related to status control, from the first radio base station,
State control information regarding the first radio base station;
Management information on radio parameters to be updated with the state control of the first radio base station;
A control station that transmits one or both of them to a second radio base station that manages at least a cell adjacent to the cell of the first radio base station.

(Appendix 42)
The state control is
New installation, removal or relocation of the first radio base station,
ON / OFF of transmission at a specific frequency managed by the first radio base station,
Wake-up / sleep of said first radio base station,
42. The control station according to appendix 41, which is any one of the above.

(Appendix 43)
The management information is
Wireless parameter settings,
Difference from before update of wireless parameter setting value,
Control information about radio parameters,
Including at least one of
The radio parameter is
Neighbor cell list,
Transmit power,
Antenna tilt angle,
Handover parameters,
Cell reselection parameters,
45. The control station according to appendix 41 or 42, including at least one of the following.

(Appendix 44)
Control information related to the neighbor cell list is
Add to or delete from the neighboring cell list of the cell of the radio base station that performs the state control,
Attribute change for a cell managed by a radio base station that performs the state control;
45. The control station according to appendix 43, wherein the control station is any one of the above.

(Appendix 45)
The attribute in the neighbor cell list is
Access restricted list (Black list),
List without access restriction (White list),
Cannot be deleted from the neighbor cell list (No Remove),
Handover not possible (No Handover),
No connection between radio base stations,
No information exchange between wireless base stations (No X2),
Transmission off (Tx-off or No Tx), or sleep (Sleep),
45. The control station according to appendix 44, including any of the following.

(Appendix 46)
When a trigger for performing state control of a radio base station occurs, before the start of the state control, at the start, or at the execution stage of the state control, state control information that is information related to the state control is notified to the control station The program which makes the computer which comprises the said radio base station perform the process to perform.

(Appendix 47)
47. The program according to supplementary note 46, which causes the computer to execute a process of receiving at least one of management information related to a radio parameter to be updated with the state control and the state control information from the control station.

(Appendix 48)
Received notification of status control information, which is information related to status control, from the first radio base station,
State control information regarding the first radio base station;
Management information regarding radio parameters to be updated in accordance with the state control of the first radio base station, or at least one cell that is adjacent to the cell of the first radio base station. A program for causing a computer constituting a control station to execute processing to be transmitted to a second radio base station.

(Appendix 49)
One radio base station (eNB) requests a control station (O & M) to turn off or on transmission in a cell when a predetermined trigger occurs to turn off or turn on transmission in a cell managed by the own station.
The radio communication method in which the control station (O & M) that receives the request changes an attribute in an adjacent relationship table (NRT) related to an adjacent radio base station (neighboring eNB) of the one radio base station (eNB).

(Appendix 50)
50. The wireless communication method according to appendix 49, wherein the control station (O & M) adds or removes a check regarding an attribute of no transmission (No Tx) for the corresponding cell.

(Appendix 51)
The radio communication method according to appendix 49 or 50, wherein the control station (O & M) transmits radio parameter information to be updated by the adjacent radio base station (neighboring eNB) to the adjacent radio base station.

(Appendix 52)
51. The radio communication method according to appendix 49 or 50, wherein the adjacent radio base station (neighboring eNB) updates its own adjacency relationship table (NRT).

(Appendix 53)
53. The radio communication method according to supplementary note 52, wherein the adjacent radio base station (neighboring eNB) updates radio parameters of the own station based on an instruction from the control station (O & M).

(Appendix 54)
The control station (O & M) transmits activation of transmission off or off to the one radio base station (eNB), and the one radio base station (eNB) performs transmission off or on, Supplementary Note 52 or 53 The wireless communication method described.

(Appendix 55)
A plurality of radio base stations (eNB) and a control station (O & M) connected to the plurality of radio base stations;
The first radio base station (eNB) requests the control station (O & M) to turn off or turn on the cell when a predetermined trigger occurs to turn off or turn on the transmission in the cell managed by the own station,
The said communication station (O & M) which received the said request | requirement changes the attribute in the adjacent relationship table (NRT) regarding the adjacent radio base station (neighboring eNB) of said 1st radio base station (eNB).

(Appendix 56)
56. The wireless communication system according to supplementary note 55, wherein the control station (O & M) adds or removes a check regarding an attribute of no transmission (No Tx) for the corresponding cell.

(Appendix 57)
57. The radio communication system according to appendix 55 or 56, wherein the control station (O & M) transmits radio parameter information to be updated by the adjacent radio base station (neighboring eNB) to the adjacent radio base station.

(Appendix 58)
57. The wireless communication system according to appendix 55 or 56, wherein the adjacent radio base station (neighboring eNB) updates an adjacent relationship table (NRT) of the local station.

(Appendix 59)
59. The radio communication system according to supplementary note 58, wherein the adjacent radio base station (neighboring eNB) updates a radio parameter of the own station based on an instruction from the control station.

(Appendix 60)
Appendix 58 or 59, wherein the control station (O & M) transmits an activation of transmission off or off to the one radio base station (eNB), and the one radio base station (eNB) performs transmission off or on. The wireless communication system described.

10 O & M (OMC)
20 Radio base station (eNB)
20 'main radio base station (eNB)
30 terminal (UE)
DESCRIPTION OF SYMBOLS 101 Signal processing part 102 Communication control part 103 Base station management part 104,205 Interface part 201,301 Receiver 202,302 Transmitter 203,303 Signal processing part 204,304 Communication control part 206 Antenna 207 State management part

Claims (11)

A control method of a radio communication system including a plurality of radio base stations,
Turn off the cell of the first radio base station,
A first notification indicating that the cell indicated by the cell global identifier is off is transmitted from the first radio base station to the second radio base station;
A second notification indicating deletion of cell information indicated by the cell global identifier is transmitted from the first radio base station to the second radio base station;
The second radio base station retains the cell information even when the cell is turned off.
Said second radio base station, when receiving the second notification indicating deletion of information of the cell, deletes the information of the cell,
A control method characterized by that.
  The control method according to claim 1, wherein the cell global identifier is an E-UTRAN Cell Global Identifier (ECGI).   The transmission of the first notification and the transmission of the second notification are performed via an X2 interface between the first radio base station and the second radio base station. The control method described. A control method of a radio base station,
Receiving a first notification indicating that the cell indicated by the cell global identifier is off from another radio base station;
A second notification indicating that the cell information indicated by the cell global identifier is to be deleted is received from the other radio base station;
Even if the cell is turned off, keep the cell information,
Delete the cell information when the second notification is received;
A control method for a radio base station.   The control method according to claim 4, wherein the cell global identifier is an E-UTRAN Cell Global Identifier (ECGI).   The control method according to claim 4 or 5, wherein the transmission of the first notification and the transmission of the second notification are performed via an X2 interface between the radio base station and the other radio base station. . A control method of a radio base station,
Turn off the cell of the radio base station,
A first notification indicating cell off indicated by the cell global identifier is transmitted to another radio base station,
A second notification indicating that the cell information indicated by the cell global identifier is to be deleted is transmitted to the other radio base station;
Even when the cell is turned off, the cell information is held by the other radio base station,
When the second notification is received, the cell information is deleted by the other radio base station.
A control method for a radio base station.   The control method according to claim 7, wherein the cell global identifier is an E-UTRAN Cell Global Identifier (ECGI).   The control method according to claim 7 or 8, wherein the transmission of the first notification and the transmission of the second notification are performed via an X2 interface between the radio base station and the other radio base station. . A program for causing a radio base station to execute processing,
A process of receiving a first notification indicating that the cell indicated by the cell global identifier is off from another radio base station;
Processing for receiving from the other radio base station a second notification indicating that the cell information indicated by the cell global identifier is to be deleted;
Even when the cell is turned off, the process of retaining the cell information;
A process of deleting the cell information when the second notification is received;
A program that executes A program for causing a radio base station to execute processing,
A process of turning off the cell of the radio base station;
A process of transmitting a first notification indicating cell off indicated by the cell global identifier to another radio base station;
A second notification indicating that the cell information indicated by the cell global identifier is to be deleted is transmitted to the other radio base station, and
Even when the cell is turned off, the cell information is held by the other radio base station,
The program in which the information on the cell is deleted by the other radio base station when the second notification is received.

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